In your own words what is the definition of reflection (in geometry)

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a.about 4 b.about 8 c.about 40 d.about 21

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a